含多直流环节的混合结构有源配电网潮流计算方法

分布式发电和先进电力电子技术在配电层面的广泛应用将使得系统中出现大量的直流环节,极大地改变传统配电网的网架结构和运行方式,对智能电网环境下配电网的快速仿真与模拟提出更高的要求。潮流计算作为快速仿真与模拟最基本也是最关键的分析计算功能必须能够适应这种变化。为此,研究了含多种直流环节的配电网中关键设备的建模方法,提出了考虑不同控制方式的换流器稳态模型,将分布式电源分为可控性和不可控性两大类,并给出了相应的处理方法;提出了基于Zbus高斯算法的配电网混合潮流求解方法,并利用换流器实现各个交直流子系统之间的潮流信息互动;最后,基于IEEE 123节点算例设计了一个典型的配电网算例,对所提出的潮流计算方法进行了测试和验证。

A Novel Power Flow Algorithm for Active Distribution System with Multiple DC Components

The development of distributed generation and advanced power electronic technologies will bring about the appearance of a large number of DC components, thus greatly changing the traditional distribution network structure and operation mode, as well as making higher requirements on distribution fast simulation and modeling (DFSM). As the most basic and critical analytic function of DFSM, the power flow algorithm has to be able to adapt to this change. Therefore, the mathematical model for the key equipment in the distribution system with multiple DC components is studied, including the steady-state model for AC/DC converters in various control modes, and the distributed generator (DG) which is classified into controllable and uncontrollable types. A novel hybrid power flow algorithm based on Zbus Gauss method is then proposed, with which the interaction and exchange of power flow information between the AC and DC subsystems realized by the AC/DC converter. Based on the IEEE 123-node test feeder, a typical active distribution system case is finally designed and used to test and validate the effectiveness of the proposed method. This work is supported by National Key Technologies R&D Program (No. 2013BAA01B03).